|Description||Count and jump if X register is negative.|
|Affected||X:=X+1, If X<0 P:=P+Δ|
JNC is an assembly instruction. It increments the X register by one. If the X register is negative (bit 15 = 1), it jumps the program execution to the address of the program counter (P register) plus the value of displacement, that can be between -128 to 127. Else it continues the program execution at (P) + 1.